Perk is working as it was intended. You were exploiting it before. Cry more buddy. The perk says restore energy for grenade kills, not fill up super for marginally hurting someone with a swarm grenade.
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No, perk does not say restore. Noob. Take a closer look
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Do I need to explain what a synonym is? I suppose anyone dense enough to not see the perk wasn't working as intended before might have trouble with such a concept.